Suppose that children whose parents are in middle to the high-income bracket will, as adults be in a middle to the high-income bracket with a probability .9 and a low-income bracket with a probability of .1 suppose also that children whose parents are in a low-income bracket well as adults, be in a middle to the high-income bracket with a probability.5 and in a low-income bracket with probability.5 A. what is the probability that a grandchild of a low-income family will be in the low-income bracket as an adult?
B. over the long-term what fraction of the adult population will be in the low-income bracket?

my guess is

step-by-step explanation:

you are playing an adventure game on your computer. you come across a troll who won't let you pass and there is no other way to get to the other side of the river except over the bridge he is guarding.

the troll is a nerd. he takes great delight in watching people struggle with his problems. very few get them. he only gives you one chance and then he changes the puzzle. you have to solve this one.

before you are four blocks. they are numbered 11,6, -7,21.

he tells that the answer he wants is minus and between -1 and - 2. you can use +, -, ×, ÷   ( and ) as many times as you like or no times at all. you don't like the way he's looking at you, but you need to cross the bridge. what do you do?

the answer is z7+8/5